Alleghanyite R060904

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Name: Alleghanyite
RRUFF ID: R060904
Ideal Chemistry: Mn2+5(SiO4)2(OH)2
Locality: Near Bald Knob, Alleghany County, North Carolina, USA
Source: Michael Scott S100995 [view label]
Owner: Michael Scott
Description: Pinkish-brown sub-rounded irregular grains
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Humite (21) ]
Quick search: [ All Alleghanyite samples (2) ]
RRUFF ID: R060904.2
Sample Description: Microprobe Fragment
Measured Chemistry: (Mn2+4.91Mg0.09)Σ=5.00(Si1.00O4)2((OH)1.57F0.43)Σ=2 ; OH not measured but estimated by difference and stoichiometry
Microprobe Data File: [ Download Excel File ]
Sample Description: Unoriented sample

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RRUFF ID: R060904
Sample Description: Unoriented sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
RRUFF ID: R060904.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 4.8736(4)Å    b: 10.706(1)Å    c: 8.2689(8)Å
alpha: 108.832(8)°    beta: 90°    gamma: 90°   Volume: 408.34(3)Å3    Crystal System: monoclinic
  File Type Information Close
Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Alleghanyite

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

Ross C S, Kerr P F (1932) The manganese minerals of a vein near Bald Knob, North Carolina, American Mineralogist, 17, 1-18   [view file]

Rogers A F (1935) The chemical formula and crystal system of alleghanyite, American Mineralogist, 20, 25-35   [view file]

Rentzeperis P J (1970) The crystal structure of alleghanyite, Mn5[(OH)2|(SiO4)2], Zeitschrift für Kristallographie, 132, 1-18   [view file]

Dunn P J (1985) Manganese humites and leucophoenicites from Franklin and Sterling Hill, New Jersey: Parageneses, compositions, and implications for solid solution limits, American Mineralogist, 70, 379-387   [view file]

Francis C A (1985) Crystal structure refinement of magnesian alleghanyite, American Mineralogist, 70, 182-185   [view file]